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grep AND search for multiple words in files

~~Hi all,~~
I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.
How do I do an AND search on words in files in folders (recursively) with grep? I'm using git bash in windows, so either a cygwin or win10 solution works.
I had thought `pipe`ing to grep would work as it seems to be the solution for multiple text on a line, but I don't think I've changed it to work for files correctly.
~~This is what I tried:~~
~~`$ grep -rnw . -e 'foo' | grep -e 'bar'`~~
Can someone tell me how to fix my grep call?

I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in.
How do I do an AND search on words in files in folders (recursively) with grep? I'm using git bash in windows, so either a cygwin or win10 solution works.
I had thought `pipe`ing to grep would work as it seems to be the solution for multiple text on a line, but I don't think I've changed it to work for files correctly.
This is what I tried:
```bash
$ grep -rnw . -e 'foo' | grep -e 'bar'
```
Can someone tell me how to fix my grep call?

grep file-handling

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